8XL running slow

I did take the Airtronic MX3 redio off and put the original traxxas one on and it performed the same. I did not check the controller or motor temp being it only ran for 1-2 minutes. Is there a way to check the motor to see if it is bad? Is it unlikely to be the controller? I will put it back together, recallibrate the radio and check the EPA. Then I will check the temp. Any further suggestions? Thank you all!